Now showing items 21-40 of 105

    • Dynamic simulation of simultaneous HVDC contingencies relevant for vulnerability assessment of the nordic power system 

      Solvang, Espen Hafstad; Sperstad, Iver Bakken; Jakobsen, Sigurd Hofsmo; Uhlen, Kjetil (Chapter, 2019)
      Large power-infeed of individual HVDC interconnectors may make the power system vulnerable to contingencies involving multiple HVDC interconnectors. This paper describes and demonstrates an approach to quantitative ...
    • Dynamic Simulations of Simultaneous HVDC Contingencies in the Nordic Power System Considering System Integrity Protection Schemes 

      Solvang, Espen Hafstad (Master thesis, 2018)
      Individual HVDC links connecting the Nordic power system to other synchronous systems may carry gigawatts of power. For the transmission system operators, who must maintain power balance to operate the grid at 50.0 Hz, the ...
    • Dynamisk analyse for nettintegrasjon av småkraft 

      Haukaas, Vebjørn Vidarsson (Master thesis, 2017)
      Et distribusjonsnett med mye lokal småkraftproduksjon kan gi stabilitetsutfordringer i nettet. Under Evanger trafostasjon er det i dag seks småkraftverk i drift. I tillegg er det fem småkraftverk som venter konsesjonsbehandling ...
    • Dynamiske analyser av ny distribuert produksjon i Namsskogan 

      Svarva, Astrid (Master thesis, 2011)
      Denne masteroppgaven omhandler en dynamisk stabilitetsanalyse av et område med mye planlagt distribuert småkraft, og er gitt av NTE Nett AS. Bakgrunnen for oppgaven er en endring av nettet i området, for å tilknytte ny ...
    • Electric hydraulic interaction 

      Helle, Ola Høydal (Master thesis, 2011)
      The hydraulic models representing hydro turbines and conduit system found instandard model libraries of power system analysis tools are often simplied mod-els. Subsequently, important information about the dynamics of the ...
    • Estimation of Power System Inertia From Ambient Wide Area Measurements 

      Tuttelberg, Kaur; Kilter, Jako; Wilson, Douglas; Uhlen, Kjetil (Journal article, 2018)
      This study presents a method of estimating the effective inertia of a power system from ambient frequency and active power signals measured by phasor measurement units. Most importantly, we demonstrate that inertia can be ...
    • Event Detection and its Signal Characterization in PMU Data Stream 

      Negi, Sanjay Singh; Kishor, Nand; Uhlen, Kjetil; Negi, Richa (Journal article; Peer reviewed, 2017)
      The potential application of signal processing techniques is not only to detect the event but also to characterize them according to physical disturbance. In this paper, event detection and its characterization algorithm ...
    • Event signal characterization for disturbance interpretation in power grid 

      Negi, Sanjay S.; Kishor, Nand; Negi, Richa; Uhlen, Kjetil (Peer reviewed, 2018)
      This paper presents the signal processing approach to detect and characterize the physical events that occur in power system using PMUs signals. A small window is applied so that the extracted spectral features belong to ...
    • Fault Detection and Prediction in Smart Grids 

      Andresen, Christian Andre; Torsæter, Bendik Nybakk; Haugdal, Hallvar; Uhlen, Kjetil (Chapter, 2018)
      Modern society is to a larger and larger extent dependant on electric energy, and hence the reliance on and utilization of the electric grid is increasing steadily. At the same time the production and consumption patterns ...
    • Feasibility Studies on a Stand-Alone Hybrid Wind-Diesel System for Fish Farming Applications 

      Holt, Marius (Master thesis, 2017)
      This thesis aims to explore feasibility related to implementing a Hybrid Wind-Diesel System for an offshore fish farm. The primary motivation behind this is to exploit the excellent wind resources along the Norwegian coast ...
    • Flexibility needs in the future power system 

      Hillberg, Emil; Zegers, Antony; Herndler, Barbara; Wong, Steven; Pompee, Jean; Bourmaud, Jean-Yves; Lehnhoff, Sebastian; Migliavacca, Gianluigi; Uhlen, Kjetil; Oleinikova, Irina; Pihl, Hjalmar; Norstrom, Markus; Persson, Mattias; Rossi, Joni; Beccuti, Giovanni (Research report, 2019)
    • Frekvens- og tidsanalyse av vannturbin- og kraftsystemmodeller 

      Ellingsen, Ole-Kristian H (Master thesis, 2015)
      In this report a hydro turbine model and a power system model have been developed. The goal is to develop models capable of preforming in a frequency analysis of the Nordic synchronous area and that these models can help ...
    • Frequency control and stability requirement on Hydro plants: System identification for performance and stability assessment 

      Jakobsen, Sigurd Hofsmo (Doctoral theses at NTNU;2019:303, Doctoral thesis, 2019)
      The Nordic transmission system operators (TSOs) have proposed new draft requirements for the providers of frequency containment reserves. These requirements include extensive tests to determine the dynamics of hydro power ...
    • Frequency Response Presentation of Power System Components 

      Alstad, Olav Westeng (Master thesis, 2015)
      This master thesis presents a method for stability analysis. The dynamics of an electric system are described through frequency dependent impedances and admittances. This is presented with the basis of an electric traction ...
    • Green and hybrid microgrid for rural electrification 

      Jha, Shailendra Kumar; Støa, Petter; Uhlen, Kjetil (Chapter, 2017)
      Green power generation technologies' interconnection to form hybrid Microgrids are seen as promising option for rural electrification in developing countries like Nepal. The use of distributed energy resources like ...
    • Harmonic Distortion in Wind Farms with Modern Wind Power Plants 

      Bekkeseth, Vegard (Master thesis, 2014)
      In this master thesis, harmonic distortion related to the use of voltage source converters (VSC) in modern wind farms has been studied. A method that can cancel harmonic content, in parks with wind turbines using VSCs, has ...
    • Hydro Turbine and Governor Modelling: Electric - Hydraulic Interaction 

      Lucero Tenorio, Luz Alexandra (Master thesis, 2010)
      This Master s Thesis work deals with the development of improved hydro turbine models for the evaluation of a hydraulic power generating system performance in response to small disturbances in power system analysis tool. ...
    • Hywind Powering Utsira - A reliability study of offshore wind connected to multiple oil and gas platforms 

      Vetvik, Idun (Master thesis, 2017)
      Today four oil and gas platforms are being commissioned in the Utsira High area. One of the platforms is powered from shore by a 120MW/+-80 kV HVDC cable. The three other platforms will first be powered by gas turbines ...
    • Identification of coherency and critical generators set in real-time signal 

      Schweta, NN; Kishor, Nand; Uhlen, Kjetil; Soumya, Mohanty (Journal article; Peer reviewed, 2017)
      For a reliable and stable operation of a power system network, it is important to monitor the dynamics of the system. For this purpose, in real system phasor measurement units (PMUs) have been installed to give information ...
    • Identification of Hydro turbine governors using PMU data 

      Jakobsen, Sigurd Hofsmo; Uhlen, Kjetil; Bombois, Xavier (Chapter, 2018)
      Recent concerns for the frequency quality in the Nordic power system has lead to an increased interest in hydro turbine governors. Among this research have been papers on identification of turbine and turbine governor ...